There's nothing like the taste of perfectly sweet and tart homemade lemonade on a hot summer day. This recipe has only three ingredients and will take you back to the summers of your childhood.
Add one cup of the water and the sugar to a saucepan. Over medium-low heat, continuously stir with a whisk until the sugar is completely dissolved. The result is a simple syrup.
Remove saucepan from heat. Pour the simple syrup into a large pitcher and refrigerate until cooled - about 30 minutes.
In the meantime, juice the lemons, reserving 1 cup of lemon juice. (If you want sliced lemon as a garnish, you may need an extra lemon or two.)
Once the simple syrup has cooled, add 5 cups of cold water to the pitcher and stir to combine.
Pour in the lemon juice and stir. Add ice and lemon slices. Serve immediately.